A thermal tap used in contain apparatus consist of a silica
rod, which fits inside at
aluminium tube whose internal
diameter is 8 mm out 0°c.
When the temperature is raised the
fit is no longer exact. Calculate
What change in temperature is necessary
to produce a channel whose cross-
Section is equal to that of a
tube of 1 mm internal
diameter.
Linear expansivity of stica = 8x10^-4 k^-1
Linear expansivity of Aluminium = 26x10^-4 k^-1